Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A receiving apparatus comprising: a receiver configured to receive a signal from a transmitting apparatus; a demodulator configured to demodulate the signal to generate values according to 4096-quadrature amplitude modulation (QAM); a deinterleaver configured to deinterleave the values; and a decoder configured to decode the deinterleaved values based on a low density parity check (LDPC) code having a code rate of 2/15, wherein the demodulator is configured to demodulate the signal based on constellation points for the 4096-QAM, and wherein each of the constellation points is represented in one of A+Bi, -A+Bi, A-Bi and -A-Bi, where A is a real component, B is an imaginary component, and each of A and B comprises one of values listed below: 0.2826 0.2885 0.2944 0.2885 0.2944 0.3003 0.2944 0.2885 0.2944 0.3003 0.3003 0.3003 0.2944 0.3003 0.2944 0.2885 0.9714 0.8596 0.7889 0.8478 0.8242 0.7771 0.8360 0.9184 1.1657 0.9479 0.8419 0.9302 0.9950 0.8713 1.0185 1.4660.
2. The receiving apparatus of claim 1 , wherein the demodulator is configured to demodulate the signal based the constellation points for the 4096-QAM corresponding to the code rate of 2/15 from among constellation points corresponding to a plurality of code rates.
3. A transmitting apparatus comprising: an interleaver configured to interleave a codeword comprising input bits and parity bits; and a constellation mapper configured to map bits of the interleaved codeword onto constellation points for 4096-quadrature amplitude modulation (QAM), wherein the parity bits are generated by encoding the input bits based on a low density parity check (LDPC) code having a code rate of 2/15, and wherein each of the constellation points is represented in one of A+Bi, -A+Bi, A-Bi and -A-Bi, where A is a real component, B is an imaginary component, and each of A and B comprises one of values listed below: 0.2826 0.2885 0.2944 0.2885 0.2944 0.3003 0.2944 0.2885 0.2944 0.3003 0.3003 0.3003 0.2944 0.3003 0.2944 0.2885 0.9714 0.8596 0.7889 0.8478 0.8242 0.7771 0.8360 0.9184 1.1657 0.9479 0.8419 0.9302 0.9950 0.8713 1.0185 1.4660.
This invention relates to a transmitting apparatus designed for high-efficiency data transmission using 4096-quadrature amplitude modulation (QAM) and low-density parity-check (LDPC) coding. The apparatus addresses the challenge of achieving reliable high-speed data transmission in communication systems by combining advanced error correction with high-order modulation. The transmitting apparatus includes an interleaver that rearranges a codeword composed of input bits and parity bits. The parity bits are generated by encoding the input bits using an LDPC code with a code rate of 2/15, which provides robust error correction capabilities. The interleaved codeword is then processed by a constellation mapper that assigns the bits to specific constellation points in a 4096-QAM scheme. Each constellation point is represented in the form A+Bi, -A+Bi, A-Bi, or -A-Bi, where A and B are real and imaginary components, respectively. The values of A and B are selected from a predefined set of 16 distinct values, ensuring optimal distribution of constellation points for improved transmission performance. This design enhances spectral efficiency while maintaining error resilience, making it suitable for high-data-rate applications.
4. The transmitting apparatus of claim 3 , wherein the constellation mapper is configured to map the bits of the interleaved codeword onto the constellation points for the 4096-QAM corresponding to the code rate of 2/15 from among constellation points corresponding to a plurality of code rates.
This invention relates to a transmitting apparatus for high-order modulation schemes, specifically 4096-QAM (Quadrature Amplitude Modulation), used in communication systems to achieve high data rates. The apparatus addresses the challenge of efficiently mapping interleaved codewords onto constellation points while supporting multiple code rates to optimize transmission performance. The transmitting apparatus includes a constellation mapper that maps the bits of an interleaved codeword onto constellation points for 4096-QAM. The mapper is specifically configured to select constellation points corresponding to a code rate of 2/15 from among a set of constellation points associated with multiple code rates. This allows the system to adapt to different transmission conditions by dynamically adjusting the code rate while maintaining compatibility with the high-order modulation scheme. The interleaved codeword is generated by encoding and interleaving input data to improve error resilience. The constellation mapper then assigns these bits to specific constellation points in the 4096-QAM scheme, ensuring efficient use of the available signal space. By supporting multiple code rates, the apparatus can balance between data throughput and error correction capability, making it suitable for varying channel conditions. This invention is particularly useful in high-speed communication systems, such as 5G and beyond, where high-order modulation and adaptive coding are essential for maximizing spectral efficiency while maintaining reliability. The apparatus ensures that the interleaved codeword is accurately mapped to the appropriate constellation points, optimizing both transmission performance and resource utilization.
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February 2, 2021
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